Gummed tape



1936. w. w. MCLAURIN GUMMED TAPE I Oct. 13,

Filed April 29, 1932 *e e W 1 2.051.04

2,057,042"; I t r 1 arm APE William W.- McLaurin,.Brookiield," Mass; Old

Colony Trust Company, executor of will of said William W. McLaurin,deceased] Application April'zil, 1932; Serial No. 608,253. 3Claims.(01454-43) f This invention relates to tapesfor sealing and mediatelyafter the fabricemerges from this ibath reinforcing cartons, boxes,packages, and the like. it passes betweennipper and lowersgue'eze rolls;It is more especially concerned with that type, 5and 6, and at thispoint it meets-afwebjof paper 1 v of tape in which a fabric backing isused, the P which is-unwound from a supply roll I; The 5 backingcarrying axwaterproof adhesive which websof paper and fabricadherestrongly to each: is normally hard and substantially. devoid of otherdue-to the presence-of the adhesive between: stickiness or tackiness,but which ,is adapted to them, and the combined web-then is cooled sufgbecome tacky when heated to-temperatures someiiciently to I causetheadhesive touhardenjor, set; what above'normal. t This coolingactionmay. be produced byjrunning'v 10' ,In applying tapes of' this'kind it iscustomary the'composite web over a cooling drum 9. after l0. to'heattheadhesive coating sumcientlyto, render I which it is wound up into theroll l0. Ifd'esired it sticky, and to"press.it against the carton; box,this web may beslit to divide it into strips" of ,the orother article ofwork'whilethe coating is in proper width before it is wjound,' ortheroll 'i ll this condition; Frequentlythe-implemen't which may betransferred to a slitting -rnachine"where 'pressesthe tapeagainststhe,work isheated sur-l thisoperation may be'performe'd. 1

ficiently to soften-the adhesive, although other 3 It willbeobservedthat this process produces, methods of accomplishing thisresult also are used. wi th a single handling of the materials, a tapeThereis a strong tendency for the adhesive to having a fabricbody'carrying a coating of wasweat through the fabric when the tape isapterproof adhesive-on its outer surface and backed plied by any ofthese methods, and if this 00- up by aweb of paper which is even moreeffec- 2o curs it produces a discoloration or staining of tive inpreventing the adhesive from sweating f the tape which is highlyobjectionable from the through to the back'of the tapeduring theapstandpoint of appearance. In order to avoid this plying operation.than is the usual back filling difficulty it has been the usual practiceto back customarily applied to the fabric. At the same fill the fabricwith clay, talc, chalk, or some other time the paper has sufficientstrength so' that a 25 filling material designed to resist the tendencysomewhat lighter fabric may be used while still of the melted adhesiveto wet the fabric. The producing a final product having a given tensileapplication of such a filling material adds substrength. Since the paperand fabric are comstantially to the expense of manufacture of tapesbined with the waterproof adhesive which also of this character. coatsthe outer surface of the fabric, an excep 30 The present invention dealsespecially with this tionally firm union is produced between the webs.problem, and it aims to improve both the tape A good grade of paper,such as a kraft paper, and the methods of making it,with a view torepreferably is used, and it is desirable also that ducing the expenseof manufacture of the tape the paper be fairly well filled in order thatit may while still producing a thoroughly satisfactory better resist anytendency of the adhesive to 35 product. I sweat through to the back ofthe tape.

The nature of the invention will be readily un- In some cases it isdesirable to apply a thicker derstood from the following descriptionwhen coating of adhesive on the outer surface of the readin connectionwith the-accompanying drawfabric than can be conveniently put on by theing, and the novel features willbe particularly method above described.Also, it is desirable 4 pointed out in the appended claims. for somepurposes to use an adhesive for com- In the drawing, 1- bining the twowebs which is different from that 'Figure 1 is a diagrammaticperspective view used for the coating. These conditions canreadillustrating one method of making tape in ac i1y be met by theprocess illustrated in Fig. 2 in cordance with this invention; which thefabric F is coated on one side with an Fig. 2 is a view similar to Fig;1 illustrating a adhesive'just before it passes betweenthe squeezesomewhat different method; and rolls ii and I2. Immediately afterreceiving this Fig. 3 is a perspective view of a short section coating,and as the fabric passes between the of tape embodying features of thisinvention. rolls, it meets the web of paper P which comes According tothe method illustrated in Fig. 1, in contact with the coated surface ofthe fabric 50 the fabric F which isto be coated is unwound and thereforeis combined securely to it. The from a supply roll 2 and is led througha bath 3 adhesive may be applied by means of any conof waterproofadhesive held in a tank or recepvenient mechanism, that shown comprisinga lifttacle l which is steam jacketed so that the ading roll l3 runningin the bath of adhesive-It and 'hesive is maintained in a meltedcondition. Imdelivering adhesive to a transfer roll 15 which, 55

in delivers it to the applying roll l8. The

adhesive is supported in a tank ll, similar to the tank 4, which mayalso be steam jacketed sothat be melted in order to be applied.

1 cooling the apparatus can handle adhesives which must After leavingthe squeeze rolls c composite web travels over suitable "guide rolls toa second adhesive applying mechanism; which may be like thatjustldescribed, including a tank ll and suitable lifting; transferring,and :appLving rolls which serve to roll a coating of adhesive 7 on tothe surface of the fabric F opposite to the backing P. The'coated webnext passes over a" drum l9, through a slittingmechanism;

indicated in general at an isflnally. rolled up,

, as indicatedat 2|.

In this process also all of od, the ladhesive coating applied to theouter surface of th'e fabric F will have a lower melting point thanthatrelied-upon'to secure the two.

webs to. each other. For example, the outer coat ing may consist of amixture" of'glue with'an asphalt emulsion and may'haveameltingpoint of;say, 150 f R, while the adhesive which corn' 7 blues the two webs mayconsist simply of a suite able 'asph alt composition having. a highermelt! ing point, say for example, 180" F. Insuclra product the danger ofhaving the adhesive strike through to the back of the tape during theap- V plying operation is reduced because of the high melting pointcharacteristics'of the intermediate fllmof adhesive; I

. Y The invention thus provides both a new prod fuct and also a simplemethod of manufacture,

which reduces the expense involved in making tapes carrying waterproofadhesives. It should} be understood that in referring to a waterproof Hu and I the' the operations} req'uired to produce the final product areperformed continuously and with a single handling of the materials.According to a preferred me'thj adhesive, the term w'aterproof" is hereused in theordinary sense of that term," as disnm guished from itsscientific sense. 1

While I have herein shown and described preferred embodiments ofmyinvention-and typical;

methods of procedure, it' will be understood that the inventionmay beembodied in other forms departing o the lv itj or score 7 thereof. c

' Having thus: described my inv ention, what 1 desire to claim as newiszll 1. A reinforcing and sealing tape comprising a'strip of fabric, apaper backing for said 1 strip l united thereto by a waterproofadhesive, a coating of waterproof adhesive on the surface of said;

fabric opposlte'tosaidbacking, both of said f hesives normally non-tackybut being y adaptedto becometacky when heated to temper;

atures substantially .above normal, and the adhesive between saidbacking and'said'fabric having a higher melting point than thatof saidcoatja strip "of "fabric, a paper backingj for .said stripunitedthereto'fby a water proof. adhesive, anda, coatingi c :diiferentwater proof adhesive'fon d fabric opposite to said backing,

'.se. nd.

3. :Afreinforbliifiatidxsealing tape comprising a strip of fab ,paperbacking -for,-s aid strip. united lj'cto an asphalt;

an'da coating of water -proof admixture of a'sph'alt and glue, -and;theadhesive 1 b'e'tween said backing and said fabric havingga highermelting point than that ofsaid coating Q2; A' reinforcingand sealingtapeeomprising I dhesives having a high t. i

bya wat'er proof adhesive having hesive more. was of-saidfabric oppositeto said backingjfs'a id coating'consisting chiefly of a

